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imx6: clock: improve calculations to get the PLL video rate

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During some tests to check the pixel clock rate in the transition from
U-Boot to the Linux kernel, I noticed that with the same configuration
of the registers the debug messages reported different rates.

The same Linux kernel calculations are now used to get the PLL video
rate.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
This commit is contained in:
Dario Binacchi 2023-04-22 16:11:17 +02:00 committed by Stefano Babic
parent 3bc6257e80
commit 41d7a7da80
1 changed files with 5 additions and 1 deletions
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6
arch/arm/mach-imx/mx6/clock.c
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@ -213,6 +213,7 @@ int enable_spi_clk(unsigned char enable, unsigned spi_num)
static u32 decode_pll(enum pll_clocks pll, u32 infreq)
{
u32 div, test_div, pll_num, pll_denom;
u64 temp64;
switch (pll) {
case PLL_SYS:
@ -272,7 +273,10 @@ static u32 decode_pll(enum pll_clocks pll, u32 infreq)
}
test_div = 1 << (2 - test_div);
return infreq * (div + pll_num / pll_denom) / test_div;
temp64 = (u64)infreq;
temp64 *= pll_num;
do_div(temp64, pll_denom);
return infreq * div + (unsigned long)temp64;
default:
return 0;
}